斑点图的重心与波前倾斜  

The Centroid of Speckle Image and the Wavefront Tilt

作　　者：刘忠[1] 戴懿纯[1] 金振宇[1] 邱耀辉[1] 

机构地区：[1]中国科学院国家天文台云南天文台,云南昆明650011

出　　处：《天文研究与技术》2009年第2期119-123,118,共6页Astronomical Research & Technology

基　　金：国家自然科学基金重点项目(10533040);国家自然科学基金面上项目(10778636)

摘　　要：论述了斑点图重心与瞬时波前倾斜的关系,证明了斑点图重心位置与瞬时波前倾斜的一致性,这种一致性无论光瞳孔径是否大于大气相干长度均是成立的。这一结论并未严格受限于近场近似条件,结论的一个重要推论是:用重心对准的位移叠加法对斑点图进行统计后所得到的传递函数就是大气望远镜综合系统的平均短曝光传递函数,该推论对于自适应光学和高分辨率图像重建技术均具有非常重要的意义。The relation between the centroid of speckle image and the wavefront tilt is discussed in this paper. The centroid of speckle image is proved mapping to the global tilt of wavefront. This relation is independent of whether the pupil aperture is larger than the atmospheric coherent length. The conclusion isnot strictly limited by the near-field approximation. An important inference is that the Optical Transfer Function （0TF） of the ＂Shift ＆ Add＂ according to the centroids of speckle images is just the traditional average short-exposure OTF given by FriedE71. The inference is very important to the adaptive optics and high resolution image reconstruction techniques, especially to those with the ＂Shift ＆ Add＂ technique.

关 键 词：斑点图 波前倾斜 点扩展函数 传递函数 

分 类 号：O436[机械工程—光学工程]